Min. [f. Gr. ἀν priv. + ὀρθ-ός straight + -ITE; named by Rose in 1823.] ‘Lime-feldspar,’ a mineral placed by Dana in the Feldspar group of Unisilicates, and occurring in small triclinic or ‘anorthic’ glassy crystals.
1833. Lyell, Elem. Geol. (1865), 590. Anorthite, so called from the oblique interfacial angles of its rhomboidal prisms.
1869. Phillips, Vesuv., x. 288. Christianite or Anorthite occurs in ejected blocks on Somma in cavities of dolomite.
